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IEEE Microwave and Wireless Technology Letters
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IEEE Microwave and Wireless Technology Letters publication
Year: 2024 | Volume: 34 | Issue: 11
Planar Mercator Smith Chart: An Alternative Approach for Active and Passive Microwave Circuits
Publication Year: 2024,Page(s):1219 - 1222
Cited by: Papers (1)
This letter proposes a Planar Mercator Smith chart (PMSC), which can be used to design and analyze both active and passive microwave circuits on a 2-D flat surface. The entire surface of the 3-D Smith chart comprises of whole impedance plane, which includes all possible loads is projected to the 2-D flat surface of the PMSC using the mathematical principle of Mercator projection. This eliminates t...Show More
Scattering Matrix of a Reciprocal and Lossless, Three-Port Power Divider
Publication Year: 2024,Page(s):1223 - 1226
The analytical expression of the scattering matrix of a lossless, reciprocal three-port junction is derived using three arbitrary real angles. This derivation extends a previously proposed method that was limited to cases with a plane of symmetry. The derived formulas are validated analytically and confirmed through both full-wave analysis of a stripline divider and experimental measurements of a ...Show More
A Broadband Attenuator Using Dual-Branch Resistors and Microstrip-Line-Loaded Slotline Structure With Improved Attenuation Slope
Publication Year: 2024,Page(s):1227 - 1230
This letter presents a new method for broadband attenuator design, which uses dual-branch resistors and microstrip-line-loaded slotline structure. Resistors are loaded on slotline to achieve attenuation property, and dual-branch configuration and implantable microstrip line in each branch are proposed to improve attenuation slope within broadband when the attenuation amount becomes large. To valid...Show More
Full Bandpass Filter Reconfigurability Through Liquid Metal Tuning and a Novel External Coupling Technique
Publication Year: 2024,Page(s):1231 - 1234
An innovative filter design with full independent control of the center frequency, bandwidth, and response ripple is demonstrated utilizing only liquid-metal actuation. This is realized on substrate-integrated waveguide (SIW) technology with tunable evanescent cavity resonators coupled by an adaptable inductive iris design. A novel external coupling mechanism utilizing liquid-metal tuning posts on...Show More
Design of Miniaturized and Highly Selective On-Chip BPFs With Mixed-Coupled Resonators
Publication Year: 2024,Page(s):1235 - 1238
In this letter, lumped-element GaAs integrated passive device (IPD) bandpass filters (BPFs) with controllable transmission zeros (TZs) and bandwidths are proposed. The mixed-electromagnetic couplings of a second-order distributed-element resonator and its various transmission responses are analyzed. Two equivalent lumped-element BPF units under different coupling conditions are investigated. To va...Show More
Dual Band Dual Mode Substrate Integrated Waveguide Filter With Mixed Coupling
Publication Year: 2024,Page(s):1239 - 1242
This letter presents a dual-band substrate integrated waveguide (SIW) filter based on the dual modes of TE101 and TE102 in multilayer structures. Its middle metal layers feature mixed-coupling structures, where the slots implement independent magnetic coupling for the TE101 and TE102 bands, and the holes implement additional electric coupling for the TE101 band. It can independently control the du...Show More
Substrate Integrated Waveguide Filtering Crossover With High Isolation Insensitive to Bandwidth
Publication Year: 2024,Page(s):1243 - 1246
A novel substrate integrated waveguide (SIW) filtering crossover with improved isolation insensitive to bandwidth is proposed. Four TE101 -mode SIW cavities and one square SIW cavity operating at two degenerate modes are used to realize the filtering crossover. The symmetrical coupling windows on each side of the square SIW cavity are used to obtain 180° phase difference between input and isolated...Show More
Broadband Filtering Power Divider Employing Hybrid Quarter Circular/Cambered SIW Cavity and MSL Resonators
Ke-Long Sheng;Xiang Wang;Song-Song Qian;Boyu Sima;Zhi-Yuan Zong;Wen Wu
Publication Year: 2024,Page(s):1247 - 1250
In this letter, a broadband filtering power divider (FPD) based on a quarter circular/cambered substrate integrated waveguide (QCCSIW) cavity and microstrip line (MSL) resonators is proposed. First, a second-order bandpass filter (BPF) is designed based on the arc-shaped coupling of the QCCSIW. Second, a pair of quarter-wavelength ( $\lambda $ /4) MSL resonators are integrated into the QCCSIW cavi...Show More
An SPDT Switch Design Featuring Minimum Phase Distortion Over Wide Input Power Drive for Phased-Array Antenna System Applications
Publication Year: 2024,Page(s):1251 - 1254
RF switch is an essential component for phased-array antennas in modern communication systems. The series-shunt configuration is preferable due to the balanced performance of high isolation and power handling capability. Conventionally, such configuration suffered from phase fluctuations over the input power drive making extra phase compensation necessary for proper system operation. Theoretical a...Show More
A W-Band Bidirectional Vector Switching Phase Shifter Using a Directional Rat-Race Coupler
Publication Year: 2024,Page(s):1255 - 1258
This letter presents a low-loss 360° bidirectional variable gain phase shifter that achieves vector-sum phase shifting without I/Q signal attenuation. The proposed phase shifter exhibits lower insertion loss than conventional designs through a directional rat-race coupler (RRC)-based asymmetric power dividing. Using transistor switches for phase states and double-pole double-throw switches (DPDTs)...Show More
A 130%-Tuning-Range Switchable Tri-Core Voltage-Controlled Oscillator Utilizing Reconfigurable Matching and Phase Compensation
Qiang Ma;Xiaojun Bi;Andy Shen;Chang Wu;Jielong Liu;Qinfen Xu
Publication Year: 2024,Page(s):1259 - 1262
This letter presents a switchable tri-core voltage-controlled oscillator (VCO) with 130% frequency tuning range (FTR). Utilizing the reconfigurable compensation stubs and reused varactors, three VCO cores are combined to achieve the switchable-free running frequency, while the FTR is greatly enlarged and the phase noise (PN) is almost unaffected.Show More
A 63–89-kHz 1/f³ Phase Noise Corner QVCO Using Enhanced Wideband-Harmonic-Shaping Technique
Publication Year: 2024,Page(s):1263 - 1266
A quadrature voltage-controlled oscillator (QVCO) utilizing the enhanced wideband-harmonic-shaping technique to improve phase noise (PN) and reduce the 1/ ${f} ^{3}$ PN corner is presented. Specifically, our QVCO uses triple-coil magnetic coupling for quadrature phase generation, additionally boosts the common-mode (CM) impedance and harmonic voltage, and contributes to a well-defined CM current ...Show More
A 5.99-GHz VCO With Wideband-Differential-Mode Second Harmonic Resonance Achieving −138.9 dBc/Hz Phase Noise at an Offset of 10 MHz
Chaowei Yang;Yong Chen;Yunbo Huang;Rui P. Martins;Pui-In Mak
Publication Year: 2024,Page(s):1267 - 1270
This article presents a voltage-controlled oscillator (VCO) with wideband-differential-mode (DM) second harmonic resonance. It features a single-turn multitap inductor plus a small tail resonator to boost the drain-to-gate voltage gain ( $A_{\text {V}}$ ). It also creates intrinsic-high-Q impedance peaks at the fundamental and double oscillation frequencies, which simultaneously achieves phase noi...Show More
A 4.5-to-13.5-GHz Single-Transformer Quad-Mode VCO With 202.5-dBc/Hz FoMT
Publication Year: 2024,Page(s):1271 - 1274
This letter reports a single-transformer quad-mode voltage-controlled oscillator (VCO) in 28-nm CMOS. Specially, our quad-mode VCO integrates the mode-switching, core-switching, and inductor-switching approaches in a single-transformer-based resonator for frequency tuning range (FTR) extension. Thus, the wideband oscillator could mitigate the tradeoff between the phase noise (PN) and octave FTR wh...Show More
A 4.5-to-13.5-GHz Single-Transformer Quad-Mode VCO With 202.5-dBc/Hz FoMT
Year: 2024 | Volume: 34 | Issue: 11
A 2.4-GHz Multiphase Inductorless PLL With Coupled-Ring Oscillators and Time-Amplifying Phase-Frequency Detector for Low Phase Noise and Robust Locking Performances
Publication Year: 2024,Page(s):1275 - 1277
Cited by: Papers (1)
This letter presents an inductorless compact 12-phase integer-N phase-locked-loop (PLL) with time-amplifying phase-frequency detector (TAPFD) to achieve low in-band phase noise. A time amplifier with automatic gain control is proposed to provide a wide detectable range during acquisition and a high gain at lock condition. The charge-pump gain is also adaptively tuned to ensure that the overall loo...Show More
Hetero-Integrated InP RTD-SiGe BiCMOS Source With Fundamental Injection Locking
E. Mutlu;C. Preuss;F. Vogelsang;R. Kress;J. Bott;B. Sievert;J. Watermann;J. Abts;A. Rennings;D. Erni;N. Pohl;N. Weimann
Publication Year: 2024,Page(s):1278 - 1281
Cited by: Papers (1)
This work shows the hetero-integration of an InP resonant tunneling diode (RTD) on a SiGe-BiCMOS mm-Wave integrated circuit (MMIC) for near-field wireless fundamental injection locking. We observe injection locking within a locking range of 26 GHz and a total power during injection locking of −3.4 dBm. The SiGe-based local oscillator (LO) is integrated with a frequency doubler and an on-chip patch...Show More
270-GHz Radiator Module for Eight-Way Incoherent Power Combining of InP HBT Oscillators
Publication Year: 2024,Page(s):1282 - 1285
This article presents a metallic radiator module, $11.5\times 5.6\times 2.5$ cm3 in size, designed to direct terahertz power with a 26° circularly symmetric radiation beam. The module combines the power from eight identical integrated oscillator chips in free space using a linear array of built-in circular horns with 17-dB gain. The oscillators operating at unlocked frequencies produce an averag...Show More
A Compact Dual-Band Rectifier Using Heterofrequency Independent Matching Technology
Qinghua Wang;Mei Yang;Qian Chen;Lixia Yang;Yingsong Li;Xiaolin Zhang;Wenquan Che
Publication Year: 2024,Page(s):1286 - 1289
This work presents a compact dual-band rectifier using heterofrequency independent matching technology (HIMT) to achieve high conversion efficiency for the application of and wireless power transmission (WPT) systems. The dual-band impedance matching network (IMN) is composed of an L-type matching network and a heterofrequency independent matching network (HIMN). Specifically, the L-type matching ...Show More
High-Efficiency Platinum-Band CMOS Rectifier Using Modified Body-Biasing Technique
Publication Year: 2024,Page(s):1290 - 1292
This letter introduces a novel approach to achieve high efficiency in high-power rectification using 180-nm complementary metal-oxide–semiconductor (CMOS) technology. The proposed rectifier targets the utilization of electromagnetic waves within the platinum band, operating within the frequency range of 0.6–0.9 GHz. Unlike conventional body-biasing techniques using pMOS transistors, where the outp...Show More
In this letter, we propose a novel self-interference (SI) cancellation solution for asymmetric in-band full-duplex (IBFD) systems, where the downlink (DL) signals are noncontiguously aggregated within the available band. The method builds on a Hammerstein model with parallel spline-interpolated 2-D lookup tables (LUTs), together with efficient gradient-descent parameter learning rules. The provide...Show More
Measurement of Complex Permittivity in 0.11–0.27 THz With a Novel Multichannel-Coupled Open Resonator
Jin Cheng;Yunpeng Zhang;Jiawei Long;Chengyong Yu;Chong Gao;Hu Zheng;En Li;Lin Qin;Xiangbao Zhu
Publication Year: 2024,Page(s):1297 - 1300
In this letter, a novel multichannel-coupled open resonator for terahertz (THz) wider frequency range measurement is proposed. The coupling of the THz open resonator is carried out through the cooperation between the PCB coupling sheet and the pressurized flange. The operating frequency of the resonator is extended through the multichannel coupling technology under one cavity. Moreover, an improve...Show More
Targeted Microwave Heating Induced by Split-Ring Resonator
Junwei Wang;Bin Yao;Rui Gong;Qinhong Zheng;Yingkai Liu;Runeng Zhong;Tai Xiang
Publication Year: 2024,Page(s):1301 - 1304
In this work, we show how localized, small-scale, and targeted heating can be induced in a microwave reaction cavity (MRC) by enhancing the electric field through the split-ring resonator (SRR) at the gap. During excitation of the cavity, an intense electric field is generated in the gap of the SRR, which heats a $4\times 4$ mm hotspot on the sample small enough to realize targeted microwave hea...Show More
Microwave Microfluidic Sensor Based on Spoof Localized Surface Plasmons for Monitoring Lubricating Oil Quality
Publication Year: 2024,Page(s):1305 - 1308
This letter proposes a sensor based on a modified hybridized spoof localized surface plasmons (SLSPs) structure, which consists of two concentric overlapped SLSP resonators. The degree of overlap between two structures is adjusted to control the resonance effect. Through the design of overlapped SLSP structure, the coupling is enhanced, thereby reducing the resonance frequency. The proposed sensor...Show More
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